| I CAN DO That! Community Interest Company | Information & communication | 2011 |
| I J a Ferronnerie Limited | Administrative & support | 2011 |
| I-Tribe Community Interest Company | Health & social care | 2022 |
| IAN Bulpin Motors (Teignmouth) Limited | Real estate | 1970 |
| Ican Mobility Ltd | Wholesale & retail | 2025 |
| Icars Contract Limited | Transport & logistics | 2018 |
| Iced Sport Limited | Extraterritorial | 2024 |
| ICM Trading Limited | Wholesale & retail | 2025 |
| Ifpo Training Ltd | Education | 2021 |
| Ilex Investments Limited | Financial services | 2012 |
| Ilex Property Investments(Torbay)Limited | Real estate | 1964 |
| ILS Associates Limited | Construction | 1997 |
| Ilsham Interiors Ltd | Construction | 2017 |
| Ilsham Valley Contractors Limited | Wholesale & retail | 1982 |
| Immune Macro - Biotic Technology UK Limited | Professional & scientific | 2001 |
| Imove Property Agents Ltd | Real estate | 2019 |
| Imperial Court Management (Torquay) Company Limited | Households | 2000 |
| Imperial Court Residents Management Limited | Households | 2019 |
| Imperial Detailing Ltd | Administrative & support | 2024 |
| Imperial Lighting Limited | Wholesale & retail | 2003 |
| IN Focus Printers Ltd | Manufacturing | 2015 |
| IN the Detail Limited | Professional & scientific | 2004 |
| Independent Cars Torbay Limited | Wholesale & retail | 2012 |
| Independent Taxis Torbay Limited | Transport & logistics | 2011 |
| Indiyang Limited | Hospitality | 2021 |
| Infinite Focus Ltd | Professional & scientific | 2022 |
| Infinitylinksuk Ltd | Wholesale & retail | 2025 |
| Infraops Ltd | Information & communication | 2026 |
| Ingsdon Residents Association Limited | Hospitality | 1986 |
| Initiate Property Management Ltd | Real estate | 2020 |
| Inka Property Ltd | Construction | 2020 |
| Inkspector Limited | Arts & recreation | 2026 |
| Innov-X Ltd | Health & social care | 2019 |
| Innovate 3SIXTY Ltd | Professional & scientific | 2016 |
| Innovative Global Solutions Limited | Professional & scientific | 2020 |
| Insignia Creative Ltd | Information & communication | 2003 |
| Inspire Shows Limited | Arts & recreation | 2010 |
| Insulated Garden Rooms Ltd | Construction | 2024 |
| Inter-Line (South West) Limited | Financial services | 2019 |
| Inter-Line Building Supplies Limited | Wholesale & retail | 1976 |
| Interior Decorative Techniques Limited | Construction | 2013 |
| International Brake Testing Services Ltd | Professional & scientific | 2024 |
| International Food Torquay Ltd | Wholesale & retail | 2025 |
| International Minimarket Plus Ltd | Wholesale & retail | 2026 |
| International Regulator of Coaching and Mentoring CIC | Information & communication | 2011 |
| International Talent Management UK Ltd | Administrative & support | 2025 |
| Interzone Solutions Limited | Information & communication | 1998 |
| Invennion Ltd | Financial services | 2024 |
| Irc&M Ltd | Other services | 2022 |
| Irfan DH Limited | Wholesale & retail | 2025 |
| Iroch Limited | Professional & scientific | 2008 |
| Ironmonger Properties Ltd | Real estate | 2018 |
| Ironwolf Consultants Limited | Professional & scientific | 2011 |
| Istanbul Barbers Torquay Ltd | Other services | 2023 |
| IT Afar Limited | Information & communication | 2010 |
| IT IS Your Money Ltd | Financial services | 2011 |
| It-Emma Limited | Information & communication | 2017 |
| Itdl Consultants Ltd | Extraterritorial | 2020 |
| Ithac Expertise Limited | Administrative & support | 2024 |
| ITI Logistics Ltd | Transport & logistics | 2025 |
| Itsa Boba Ltd | Hospitality | 2021 |
| Ivsav Ltd. | Construction | 2014 |
| IVY Grace Ltd | Wholesale & retail | 2019 |
| J a Hamilton Builders Limited | Construction | 2003 |
| J a Hurson Wealth Management Limited | Financial services | 2013 |
| J C Building Contractors (SW) Limited | Construction | 2013 |
| J C Windows (SW) Ltd | Construction | 2024 |
| J G Contracting (SW) Limited | Construction | 2016 |
| J J Brophy Building Company Limited | Construction | 2005 |
| J Porter Accounting Services Limited | Professional & scientific | 2021 |
| J Swan Hair Ltd | Other services | 2024 |
| J&T Electrical Services Ltd | Construction | 2021 |
| J&T Rentals Limited | Real estate | 2021 |
| J-M Milandre Limited | Professional & scientific | 1992 |
| J.A.Y.S Waste Removal Limited | Water & waste | 2024 |
| J.J. Insulations (Torbay) Limited | | 1983 |
| J.P. Ravenscroft & Co Ltd | Information & communication | 2003 |
| J.T. Tibbetts & Sons (Southern) Limited | Construction | 1971 |
| J.T.T. Contracting Limited | Construction | 1990 |
| J.T.Tibbetts and Sons (Builders) Limited | Real estate | 1963 |
| J.V. and B.V. Hinder Limited | Administrative & support | 2004 |
| JA Electrical Contractors Ltd | Construction | 2020 |
| JAA Dent Limited | Health & social care | 2016 |
| Jaan (WSM) Ltd | Professional & scientific | 2012 |
| Jackson Four Holdings Ltd | Financial services | 2017 |
| Jade Building Ltd | Real estate | 2024 |
| Jaffa Law Ltd | Professional & scientific | 2019 |
| Jahanbani Trading Ltd | Wholesale & retail | 2025 |
| JAM Design Studio Limited | Professional & scientific | 2022 |
| JAM Leisure (Park Lane) Limited | Hospitality | 2012 |
| JAM Leisure (TQ) Limited | Hospitality | 2016 |
| JAM Leisure (TS) Limited | Hospitality | 2017 |
| JAM Leisure Group Limited | Financial services | 2018 |
| JAM Leisure Property Limited | Real estate | 2001 |
| James & Alex Nicholls LLP | | 2008 |
| James Barkell Wealth Management Limited | Financial services | 2015 |
| James Burnham Limited | Construction | 2015 |
| James Cook Composition Ltd | Information & communication | 2025 |
| Jamie Designs Ltd | Professional & scientific | 2025 |
| Jampot Woowoo Ltd | Wholesale & retail | 2014 |